LG Multi V ARWN Series, Installation Manual

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ENGLISH
CAUTION
Do not directly connect the drain outlet to the water pipe outlet.
(It can cause problems to the product.)
!
• Always install a strainer (50Mesh or above) at the entrance of the
water pipe. (When sand, trash, rusted pieces get mixed into the
water supply, it can cause problems to the product due to block-
ing)
- If On/Off valve is applied, by interlocking with outside unit, it can
save the energy consumption of pump by blocking the water
supply to the outside unit not operating. Select appropriate valve
and install on site if necessary.
• Install a pressure gauge and temperature gauge at the inlet and
outlet of the water pipe.
• Flexible joints must be installed not to cause any leakage from the
vibration of pipes.
• Install a service port to clean the heat exchanger at the each end
of the water inlet and outlet.
• For the components of the water pipe system, always use com-
ponents above the designed water pressure.
Water pipe connection
• The water pipe should be the same size of the connection on the
product or more.
• If necessary install the insulation material in the water pipe
inlet/outlet to prevent water drop, freeze and to save energy.
(Use the above 20mm thickness PE insulation material.)
• Tightly connect the socket to the water pipe refer to below table
for recommended specification.
(Too much torque may cause the damage of the facility.)
Water pipe
outlet Gate valve
Gate valve
Service port
Pressure gauge Temperature gauge
Service port
Strainer
Drain line
Condensed
water drain
Water pipe
Inlet
mm inch (kN) (kgf) (kN) (kgf) (N.m) (kgf.m) (N.m) (kgf.m)
12.7 1/2 3.5 350 2.5 250 20 23 5 3.5
19.05 3/4 12 1200 2.5 250 20 2 115 11.5
25.4 1 11.2 1120 4 400 45 4.5 155 15.5
31.8 1 1/4 14.5 1450 6.5 650 87.5 8.75 265 26.5
38.1 1 1/2 16.5 1.7 9.5 0.95 155 16 350 35.5
50.8 2 21.5 2.2 13.5 1.4 255 26 600 61
Pipe thickness Shear stress Tensile stress
Bending
moment
Torque
Water pipe
connection
Water pipe inlet
Water pipe outlet
Strainer on water pipe
DEVICE PROTECTION UNIT
Upper graph is a theoretical value for selection and it may be different
according to specification of strainer.
To protect the water cooling type product, you must install a strainer
with 50 mesh or more on the heat water supply pipe.
If not installed, it can result in damage of heat exchanger by the follow-
ing situation.
1
Heat water supply within the plate type heat exchanger is com-
posed of multiple small paths.
2
If you do not use a strainer with 50 mesh or more, alien particles
can partially block the water paths.
3
When running the heater, the plate type heat exchanger plays the
role of the evaporator, and at this time, the temperature of the
coolant side drops to drop the temperature of the heat water sup-
ply, which can result in icing point in the water paths.
4
And as the heating process progresses, the water paths can be par-
tially frozen to lead to damage in plate type heat exchanger.
5
As a result of the damage of the heat exchanger from the freezing,
the coolant side and the heat water source side will be mixed to
make the product unusable.
Heat Source
Water
Refrigerant
1. Pollution of
Heat source
2. Partially frozen 3. Damage
Head loss of strainer on water pipe
96
50
45
30
15
0
0 30 60 90 120 150 0 60 120 180 240 300
60
50
45
30
15
0
60
192
I/min
kpa kpa
I/min
: Suggestion range
: Allowed range
ARWN100LAS4 ARWN200LAS4
Flow switch work
• It is recommended to install the flow switch to the water collection
pipe system connecting to the outside unit.
(Flow switch acts as the 1st protection device when the heat water
is not supplied. If a certain level of water does not flow after in-
stalling the flow switch, an error sign of CH24 error will be displayed
on the product and the product will stop operating.)
• When setting the flow switch, it is recommended to use the product
with default set value to satisfy the minimum flow rate of this prod-
uct. (The minimum flow rate range of this product is 50%. Reference
flow rate : 10HP – 96LPM, 20HP – 192LPM
• Select the flow switch with the permitted pressure specification con-
sidering the pressure specification of the heat water supply system.
(Control signal from outside unit is AC 220V.)